In those three years alone, there were around 6000 Jasons born in NSW and 4000 Jasons born in Victoria. It was peak Jason.

And then parents started getting over it. Before the end of the 1970s, Jason was out of the top 10, and it was all downhill from there. It hasn’t been in the NSW or Victorian top 100 for years. Parents nowadays go for similar-sounding names like Jayden and Mason and Jaxon.

Of course, all names come in and go out, but no other boys’ name has come in so fast, reached such a dizzying height, and then disappeared again. The other number-one boys’ names of last century – John, Peter, David, Michael, Matthew, etc – were all massively popular for decades. (If you would like to see this information plotted in a colourful graph, go here or here.)

That’s why Jason can claim the title of Australia’s trendiest ever boys’ name (at least, as far as records go back). And that’s why we know lots of Jasons in their forties, and almost no old men or little kids with the name.

Of course, Australia isn’t the only nation to fall for Jason. Jason has previously been revealed as America’s trendiest boys’ name of the past 100 years.

But there, it didn’t reach number one. Americans didn’t love Jason quite as much as Australians did.

Neighbours' Jason Donovan will forever be one of our favourite Jasons. Image: Getty.

So why all this love for Jason? And what’s it like having the trendiest boys’ name?

Mamamia spoke to a Jason who was born on the early side of the Jason peak, in 1968. His Greek father named him after Jason and the Argonauts from Greek mythology, and he loves his name.

“My mother wanted to call me Dwayne – which, thank goodness, didn’t get up,” he says. “My wife tells me constantly that she wouldn’t have married me, had I been named Dwayne.”

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Jason was one of only two Jasons at his school. But when his own child started school and he went along to a fathers’ get-together, it was a different story.

“Introducing, it was like Paul, Jason, and the rest of them were Jasons,” he remembers. “There were five Jasons, and we were all about the same age. It was hilarious.”

Another Jason, who was born in 1970, is used to being surrounded by Jasons.

“I describe it as ‘children of the ‘70s syndrome’ when I talk to my friends called Jason,” he says. “I have lots of them.”

A third Jason says he’s never been comfortable with the name – partly because it’s so common, and partly because he doesn’t think it suits his Dutch/Irish heritage.

“When I was younger I nearly changed it legally, but now I feel stuck with it,” he explains.

Here are the top baby names of 2017. Do you agree with the list?

Video by MMC

Meanwhile, a fourth Jason says there’s something special about the name, which all Jasons would already know.

“I can remember being chuffed that my name was hidden in the calendar. When the months are expressed as their first letter, you get ‘JASON’ from July August September October November.”

Cool. So are any babies being given the name Jason anymore?

Well, there is a small ray of hope. Last year, Jason re-entered the top 100 in South Australia for the first time in years. There were only 20 Jasons born in the state –compared to 493 in 1972 – but it’s a start.

Who knows? This could be the beginning of the Jason revival.

Do you agree with this? How many Jasons do you you know? Tell us in a comment.

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